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Podívejte se na záznamy přednášek z konference Devel.cz 2019
6.12.2019
IoT, vývoj hardware a JavaScript. To byla hlavní témata letošní konference Devel.cz 2019. Podívejte se na záznamy přednášek
Filtering Lists Dynamically With Vue on the Server Side is Easier Than You’d Think
4.12.2019
I recently attended the ARTIFACT conference in Austin, TX, and was inspired by a few talks about accessibility through the lens of site performance. It became clear to me that there is this tendency to rely on big JavaScript frameworks to handle the work — like React, Vue, and Angular — but that...
State of JavaScript 2019 Survey
3.12.2019
Well, hey, look at that — it's time for this year's State of JavaScript survey!
You have taken this survey last year. Or in 2017. Or in 2016. It's been going on for a little while now and it always lends interesting insights into things like the features developers are using, the popularity...
Image Lazy Loading
25.11.2019
Lazy loading images is a practice that’s been popular for a decade and for good reason: images are usually the heaviest downloads on a given webpage and avoiding unloading images that are never seen saves the user bandwidth. There are plugins for lazy loading images in every JavaScript...
Build your own React
20.11.2019
Wowza! Rodrigo Pombo’s article about how to build React from scratch is fantastic, not only because it’s well written, but because of the outstanding interaction design: each line in the code examples ge highlighted and explored in further detail as you scroll down the page.
This makes it super...
Oh, the Places JavaScript Will Go
19.11.2019
I tend to be pretty vocal about the problems client-side JavaScript cause from a performance perspective. We're shipping more JavaScript than ever to our user's devices and the result is increasingly brittle and resource-intensive experiences. It's... not great.
But that doesn't mean I don't like...
How We Perform Frontend Testing on StackPath’s Customer Portal
15.11.2019
Nice post from Thomas Ladd about how their front-end team does testing. The list feels like a nice place to be:
TypeScript - A language, but you're essentially getting various testing for free (passing the right arguments and types of variables)
Jest - Unit tests. JavaScript functions are doing...
10 Interesting JavaScript and CSS Libraries for November 2019
13.11.2019
An amazing payment form widget, a new Vue.js framework for static websites, and lots more in our compilation for the month of November
Making an Audio Waveform Visualizer with Vanilla JavaScript
12.11.2019
As a UI designer, I’m constantly reminded of the value of knowing how to code. I pride myself on thinking of the developers on my team while designing user interfaces. But sometimes, I step on a technical landmine.
A few years ago, as the design director of wsj.com, I was helping to re-design...
React Hooks, které potřebujete znát
12.11.2019
React s verzí 16.8 přináší zásadní novinku, a tou jsou Hooks, které mají přinést řešení pro hned 3 největší problémy, se kterými se v Reactu potýkáme. Implementace komponent pomocí tříd, sdílení logiky, nepraktický způsob práce s životním cyklem komponent. Představíme vám React Hooks a na konci...
What is super() in JavaScript?
6.11.2019
What's happening when you see some JavaScript that calls super()?.In a child class, you use super() to call its parent’s constructor and super.<methodName> to access its parent’s methods. This article will assume at least a little familiarity with the concepts of constructors and child...
JavaScript waitForTime
6.11.2019
I write a lot of tests for new features within Firefox DevTools. We have hundreds of “mochitests” which open the browser and perform synthetic actions like clicking, typing, and other user actions. I’ve previously written about waitForever which essentially halts following actions...
Comparing the Different Types of Native JavaScript Popups
31.10.2019
JavaScript has a variety of built-in popup APIs that display special UI for user interaction. Famously:
alert("Hello, World!");
The UI for this varies from browser to browser, but generally you’ll see a little window pop up front and center in a very show-stopping way that contains the message...
Are There Random Numbers in CSS?
29.10.2019
CSS allows you to create dynamic layouts and interfaces on the web, but as a language, it is static: once a value is set, it cannot be changed. The idea of randomness is off the table. Generating random numbers at runtime is the territory of JavaScript, not so much CSS. Or is it? If we factor in...
What I Like About Writing Styles with Svelte
23.10.2019
There’s been a lot of well-deserved hype around Svelte recently, with the project accumulating over 24,000 GitHub stars. Arguably the simplest JavaScript framework out there, Svelte was written by Rich Harris, the developer behind Rollup. There’s a lot to like about Svelte (performance, built-in...
How Cryptocurrency Developers Can Earn Bitcoin Cash With REST APIs
22.10.2019
A recent video by Chris Troutner, Senior Javascript Developer at Bitcoin.com, points out a problem with anti-profit seeking approaches to crypto development, and how devs can incentivize growth and attract business using REST APIs to earn BHC. Without incentives, Troutner notes, many promising...
Options for Hosting Your Own Non-JavaScript-Based Analytics
18.10.2019
There are loads of analytics platforms to help you track visitor and usage data on your sites. Perhaps most notably Google Analytics, which is widely used (including on this site), probably due to it's ease of integration, feature-richness, and the fact that it's free (until you need to jump up...
How to Create a QR Code
15.10.2019
QR codes aren’t everyone’s cup of tea but I quite like them. If I see something I want to remember or check out later, especially when on the road, it’s super easy to take a quick picture — it’s much easier than trying to remember a URL and much faster than typing...
10 Interesting JavaScript and CSS Libraries for October 2019
15.10.2019
Our resources collection for the month of October includes helpful fronted libraries, a cute CSS framework, and some awesome Node.js tools
Jaká byla Nordic.js 2019
14.10.2019
Série evropských JavaScriptových konferencí JSConf zaznamenala letos výraznou změnu, když její hlavní a zakládající berlínská odnož oznámila ukončení svého působení. Tíha zodpovědnosti se tak přesouvá na ostatní regionální organizátory